Geodesic
Lower and upper neighborhoods in set with closure property
Prikladnaâ diskretnaâ matematika, no. 3 (2009), pp. 5-13

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Lower and upper neighborhoods in set with closure property are studied. 
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     author = {N. G. Parvatov},
     title = {Lower and upper neighborhoods in set with closure property},
     journal = {Prikladna\^a diskretna\^a matematika},
     pages = {5--13},
     publisher = {mathdoc},
     number = {3},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PDM_2009_3_a0/}
}
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%J Prikladnaâ diskretnaâ matematika
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N. G. Parvatov. Lower and upper neighborhoods in set with closure property. Prikladnaâ diskretnaâ matematika, no. 3 (2009), pp. 5-13. http://geodesic.mathdoc.fr/item/PDM_2009_3_a0/